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Geometrical effects on the concentrated behavior of heat flux in metamaterials thermal harvesting devices
Citation Link: https://doi.org/10.15480/882.2061
Publikationstyp
Journal Article
Publikationsdatum
2017-10-30
Sprache
English
Author
TORE-URI
Enthalten in
Volume
7
Issue
10
Start Page
105322
Citation
AIP Advances 10 (7): 105322 (2017)
Publisher DOI
Scopus ID
Publisher
American Institute of Physics
Thermal harvesting devices based on transformation optics, which can manipulate the heat flux concentration significantly through rational arrangements of the conductivities, have attracted considerable interest owing to several great potential applications of the technique for high-efficiency thermal conversion and collection. However, quantitative studies on the geometrical effects, particularly wedge angles, on the harvesting behaviors are rare. In this paper, we adopt wedge structure-based thermal harvesting schemes, and focus on the effects of the geometrical parameters including the radii ratios and wedge angles on the harvesting performance. The temperature deformations at the boundaries of the compressional region and temperature gradients for the different schemes with varying design parameters are investigated. Moreover, a concept for temperature stabilization was derived to evaluate the fluctuation in the energy distributions. In addition, the effects of interface thermal resistances have been investigated. Considering the changes in the radii ratios and wedge angles, we proposed a modification of the harvesting efficiency to quantitatively assess the concentration performance, which was verified through random tests and previously fabricated devices. In general, this study indicates that a smaller radii ratio contributes to a better harvesting behavior, but causes larger perturbations in the thermal profiles owing to a larger heat loss. We also find that a smaller wedge angle is beneficial to ensuring a higher concentration efficiency with less energy perturbations. These findings can be used to guide the improvement of a thermal concentrator with a high efficiency in reference to its potential applications as novel heat storage, thermal sensors, solar cells, and thermoelectric devices.
DDC Class
530: Physik
More Funding Information
National Natural Science Foundation of China (Grant Nos. 51776050 and 51536001).
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